Liquid boiler



Aug. 23, 1932- w. 1.. R. EMMET LIQUID BOILER Filed Oct. 1, 1931 khanIhventor William L. R. Emmet,

His Attorney.

Patented Aug. 23, 1932 WILLIAM L. R. EMIVIET, OF SCHENECTADY, NEW'YORK,TRIO COMPANY, A CORPORATION OF ASSIGNOR T0 GENERAL Emonew YORK p LIQUIDBOILER Application filed October 1, 1931. SerialNo. 5663 89.

The present invention relates to boilers for generating vapor fromliquid, and especially to boilers intended for vaporizing liquids havinga high boiling point as compared to :water and which may becomparatively heavy. Such a liquid is mercury, mercury vapor now beingutilized for driving elastic fluid turbines and for other purposes, suchas a heating agent in connection with industrial processes.

The invention relates particularly to boilers of the type such as thatdisclosed in the application of myself and B. P. Coulson, Jr, Serial'No.306,486, filed September 17, 1928, and has for its object to provide animproved construction arrangement in a boiler of this type.

For a consideration of what I believe to be novel and my invention,attention is .j directed to the accompanying description and the claimsappended thereto.

In the drawing, Fig. 1 is a view partly in section of a boiler structureembodying my invention; Fig. 2 is a detailed sectional view Ion a largerscale of a single boiler tube, and

Fig. 3 is a sectional view taken on the line 7 33 of Fig. 2.

Referring to the drawing, 1 indicates a boiler drum or casing and 2indicates boiler tubes depending from the lower portion thereof. Eachboiler tube 2 comprises an outer tube 3 which at its upper end is fixedin an opening in drum 1 and is welded thereto as indicated at i, and acore 5 which is 5 located inside the tube 3 and provides a centralpassage 6 through which the liquid to be vaporized flows to the bottomof the tube, and an annular passage 7 through which the liquid flowsupward and in which it is vapor- .Iized. Core 5 is held in spacedrelation to outer tube 3 by means of projections 8 and 9 formed on thecore. Inside drum or casing 1 and located in spaced relation thereto,isa bafile plate 10 provided with openings 11 through which the liquidto be vaporized is supplied to core passages 6. Baflieplate 10" lsheldin spaced relation to the adjacent surface of drum 1 by suitableprojections 12 which may be in'the form of heads of studs threaded intothe baflle plate. Associated with the boiler structureare filler blocks13 which serve to occupy space within the drumsoas to decrease thevolume which is required to be filled with liquid to be vaporstructure,which lagging may be fixed in place in any suitable manner. Liquidmercury is conveyed through opening 11 to core passage 6 by means of atube 15, theupper end of which is suitably fastened, as by weld ing, inthe bafile plate opening 11 while the lower end depends some-di stanceinto the core and is held positioned relatively thereto by an annularprojection or enlargement 16. The construction and arrangement of tube15 forms the subject matter of the application' of Bevis P. Coulson,Jr., Serial No.

478,399, filed August 28, 1930,and assigned' application My presentinvention relates particularly j to 'the assignee of the present and ismore particularly described therein.

to the construction of core 5 for use ina boiler tube of the typedescribed. 1

According to my invention, I construct the corefrom a plurality oflayers of metal which closely engage each other, the metal being onewhich offers relatively high resistance to the transfer of heat. Forthis purpose I have found 8 per cent has a heat resistance of the orderof'two and one-halftimes that of ordinary cold rolled steel, to besatisfactory. The successive layers of the core are formedv preferablyfrom a sheet wound spirally on itself and this is the constructionillustrated in the drawing wherein '17 indicates the successive layersof the 'corefi lhe core may be provided with outer and inner walls 18and 19 between which the wound up-layers are located and the whole maybe suitably weldedtogether' lzed. 14 indicates lagging for the boilersilicon steel, which 6 so that relatively cool liquid is supplied to thebottom of the tube to keep the tip cool,

it being understood that the lower end of the tube is subjected to themost intense heat of the fire. By constructing the tube of successivelayers of a metal having relatively high heat resistivity, but a smallamount of heat will reach the liquid through passage 6.

In constructing a laminated core embodying my invention, a certainamount of void is left between the successive layers and this voidbecomes filled with liquid. In the core of mercury, mercury vapor 1s arelatively poor conductor of heat, and should the tube becomeexcessively heated the mercury liquid between the lannnatlons fwouldbecome va- 1 porized, thereby increasing the resistance to heat flow inthe core. This functions to resist to a greater extent transfer of heatto the mercury flowing through the down tube, thus insuring that itremains relatively cool in spite of greater heat towhich the tube issubjected.

As a result, relatively cool liquid is still supplied to the tip of thetube for absorbing heat from it. Thus the liquid between the layers ofthe core serves as a sort of safety device against abnormaloperation ofthe tube.

What I claim as new and desire to secure by Letters Patent of the UnitedStates, is

1'. In a boiler structure, the combination of a casing and a boiler tubeconnected to the casing comprising an outer tube and a core in the outertube having a passage for conveying liquid to the lower end of the outertube, the wall of said core comprising a plurality of layers of sheetmetal in close contact with each other having relatively high heatresistivity.

2. In a boiler structure, the combination of acasing and a boiler tubeconnected to the casing comprising an outer tube and a core in the outertube having a passage for con veying liquid to the lower end of theouter tube, the wall of said core comprising a sheet of metal havinghigh heat resistivity spirally metal of high heat resistivity in closecontact with each other.

5. A tubular core for a boiler tube the wall of which comprises aplurality of layers of silicon steel in close contact with each other.

6. A tubular core for a boiler tube the wall of which comprises a sheetof metal of high heat resistivity spirally wound on itself to provide aplurality of closely contacting layers.

In witness whereof, I have hereunto set my hand.

WILLIAM L. R. EMMET.

as it flows down

